What Is a Dunning Letter? 5 Templates That Get You Paid
An invoice is three weeks overdue. You have sent two polite emails. Nothing. The next message decides whether this becomes a payment or a write-off.
That message has a name, and most small businesses have never heard it. A dunning letter is the formal, escalating notice you send when a reminder has already failed. It is not an angry email. It is a dated, factual document that creates a record, states what you are owed, and makes clear what happens next.
Here is what one is, when to send it, five you can copy, and the law behind it in the UK and the EU.
What is a dunning letter?
A dunning letter is a written notice from a supplier demanding payment of an overdue invoice. The word comes from an old English verb meaning to persistently demand what is owed, and persistence is the point. One letter is a nudge. A sequence is a process.
Three things separate a dunning letter from a friendly chase:
- It is dated and referenced. Invoice number, amount, due date, days elapsed.
- It escalates. Each one in the sequence is firmer than the last, on a schedule you set in advance rather than on how irritated you feel.
- It builds a record. If the debt goes to recovery, this paper trail is the evidence that you asked properly and gave fair warning.
That third point is the one people miss. The letters are aimed not only at the client, but at whoever reads the file afterwards.
Dunning letter vs payment reminder vs demand letter
These three get used interchangeably and are not the same thing. Sending the wrong one at the wrong time either damages a good relationship or wastes a month.
| Payment reminder | Dunning letter | Demand letter | |
|---|---|---|---|
| Tone | Helpful | Firm and factual | Formal and legal |
| When | Before or just after the due date | 7 to 30 days past due | After dunning has failed |
| Purpose | Keep the relationship warm | Create a documented trail | Signal legal action |
| Written by | You | You | Usually a solicitor |
Most unpaid invoices are resolved in the middle column. A payment reminder email handles the first week and a solicitor handles the last resort. Everything between is dunning, and that is where the money comes back.
The dunning sequence that collects
Decide the schedule before the invoice is late, because deciding it afterwards means deciding it while annoyed.
- Seven days before the due date. A courtesy note confirming the invoice arrived and was approved.
- On the due date. A neutral marker, because payment may already be in transit.
- Seven days late. The first dunning letter. Direct, asks for a date.
- Fourteen days late. The second dunning letter. References the terms and sets a reply deadline.
- Thirty days late. Final notice before recovery.
The first item is the one almost nobody sends, and it prevents the rest. Most late payments are not refusals, they are approval delays. Learning on day minus seven that an invoice is stuck in someone’s queue gives you a week to fix it.
Five dunning letters you can copy
1. Seven days before the due date
Subject: Invoice INV-1042 due 24 October, £2,400
Hi [Name],
Invoice INV-1042 for £2,400 is due on 24 October, attached again here.
Could you confirm it has been approved for payment, and tell me if anything else is needed from our side before then?
Thanks,
[Your name]
2. On the due date
Subject: Invoice INV-1042 due today, £2,400
Hi [Name],
A quick note that invoice INV-1042 for £2,400 is due today, attached for reference.
If payment has already been sent, please ignore this and let me know the date so I can match it up.
Thanks,
[Your name]
3. Seven days late, the first dunning letter
Subject: Overdue: invoice INV-1042, £2,400, 7 days past due
Hi [Name],
Invoice INV-1042 for £2,400 was due on 24 October and is now seven days overdue.
Could you confirm a date when payment will be processed? If there is a query on the invoice, tell me and I will resolve it today.
Payment details:
Account name: [Name]
Sort code / routing: [Number]
Account number: [Number]
Reference: INV-1042
Thanks,
[Your name]
Two deliberate choices. Asking for a date rather than for payment is harder to ignore, because silence becomes visible. And inviting a query flushes out a dispute that has sat there quietly for a week.
4. Fourteen days late, the second dunning letter
Subject: Second notice: invoice INV-1042, £2,400, now 14 days overdue
Dear [Name],
Invoice INV-1042 for £2,400 was due on 24 October and is now fourteen days overdue. This is my second notice and I have had no response to the first.
Our agreed terms are net 30. Please confirm by [date, three working days out] when this will be paid. If there is a problem with the invoice, I would rather know now.
Regards,
[Your name]
The shift is small but real. This dunning letter states rather than asks, references the agreed terms, and puts a deadline on the reply instead of on the payment. If your terms were never set, our guide to net 30 payment terms covers what should have been agreed up front.
5. Thirty days late, final notice
Subject: Final notice before further action: invoice INV-1042, £2,400
Dear [Name],
Invoice INV-1042 for £2,400 was due on 24 October and remains unpaid thirty days later. I wrote on [dates] with no reply.
Unless payment is received in full by [date, seven days out], I will begin recovery of this debt, including statutory interest and the fixed compensation I may claim on a late commercial payment.
A statement of the account is attached. I would prefer to resolve this directly.
Regards,
[Your name]
Keep this plain, dated and free of anger. If the debt goes anywhere formal, this is the letter that gets read. Attaching a statement of account removes the “which invoices do you mean” reply.
What the law actually gives you
A final dunning letter only carries weight if what it claims is true. In most places your clients are, it is.
In the UK, late payment legislation lets you charge statutory interest at the Bank of England base rate plus 8 percent, as simple interest, on a commercial debt. You can also claim a fixed sum for recovery costs by debt size: £40 under £1,000, £70 from £1,000 up to £10,000, and £100 at £10,000 or more. Where nothing was agreed, payment becomes late 30 days after the later of supply and the invoice being received. The official position is on the government page covering debt recovery costs.
Across the EU, the Late Payment Directive gives public authorities a 30 day deadline and allows businesses contractual freedom up to 60 days. Statutory interest runs at a minimum of 8 percentage points above the European Central Bank reference rate, with minimum fixed compensation of 40 euro. Several member states went further, so check your local rate.
In the US there is no general federal equivalent for business to business debts. Your contract is what you rely on, which makes writing a late payment fee into the agreement before work starts far more important.
Four mistakes that cost you the money
Apologising for asking. “Sorry to chase” tells the reader the request is negotiable. Polite and direct are not in conflict.
Sending to one named person. They go on leave and your invoice stops existing. Copy the accounts inbox from the first dunning letter onwards.
Leaving the payment details out. Making someone scroll back through a thread is a reason to deal with it tomorrow.
Never escalating. If the fourth letter sounds like the first, you have taught the client that your deadlines mean nothing. Escalating too fast is the opposite failure, and a final notice on day eight reads as panic.
Where dunning fits with everything else
Dunning is the last line of defence, not the system. Most of the work happens earlier, in a clear invoice and terms agreed before the job. See writing an invoice properly, the follow up email after no response for silence rather than refusal, and how to ask for payment professionally on tone.
Frequently asked questions
Is a dunning letter a legal document?
Not in itself. It is a commercial notice, not a court filing. It becomes useful evidence if the debt goes to recovery, because it proves you asked clearly and gave a reasonable chance to pay.
How many dunning letters should I send?
Three, inside a five step sequence that starts with two reminders. Seven, fourteen and thirty days past due is the pattern that works. More than that and they stop being read.
What if the client never replies at all?
Send the final notice with a dated deadline, copy the accounts inbox and attach a statement of account. After that the next step is recovery or a solicitor’s demand letter, not another email.
Posted or emailed?
Email the first two, because it is faster and timestamped. For the final notice send both and keep proof of postage.
The short version
A dunning letter works when it is specific and fails when it is apologetic. Put the invoice number and amount in the subject line, attach the invoice every time, repeat the payment details, and ask for a date.
Send three across the cycle and let the tone harden on schedule rather than on how annoyed you feel. In the UK and EU the law backs your final notice with real interest and real recovery costs. Set the sequence once, and chasing stops being a weekly decision.
